Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.

I have an excess of rocks in my soil - have collected buckets of them - so anything like that I fill in any open spaces with rocks. A homemade narrow sandbag would probably serve the same purpose. It depends if pretty is a factor or not.

Ooo, ooo aren't there door things - those things that are supposed to stop drafts at the bottoms of doors - just decorative sandbags?

Compresses, lightweight and easy to handle, easy to cut to size, easy to punch holes in for drainage. I used it all the time to level water features in ponds.

I went "exotic" *(read as expensive and stupid) on my SFG and put down those "envirolite" mats the level out the spot. They worked well, but no better than my former "el cheapo" methods .... and they cost more than building the SFG box did

This is the best picture I can get right now (taken from the window right beside my computer, lol). It's too wet outside and DH is training Cub Scout leaders right now so I can't get out without 3 little ones following and getting all muddy!

The cardboard is my initial attempt to fill in the gaps. I think this plus stapling the new weed block up the sides will probably do it, although I am pondering the weather stripping idea, as we do just happen to have some of that lying around! The weed block that's down now is recycled stuff that has a few holes in it, but I figured better to put it down underneath than in the trash.

The pieces of foam or old carpet patches (if you find someplace ripping out carpet, they will give it to you free ....also the carpet stores sometimes have remnants from cutting that they are happy to part with) on the outside edges will work, as well as flipping the frame up and stapling the fabric to the inside of the frame (don't pull it too tight...leave yourself some slack if you can.

There is also the wet-newspaper trick on the inside of the box.

Only other things I can think of are all labor intensive or expensive (or possibly toxic) ...and thats probably not what yr looking for

Our SFG is on a slight slope -- sort of slopes two different directions, actually. We did two different things to make the boxes sit level. We either dug down into ground and removed dirt... or we flipped thick layers of sod from one area to another. Some needed more work than others. Some have settled and need fixing next spring.

When you are looking up at our garden you see more of the box at the bottom. Look at the box on the right corner, you can see how the top is sort of sitting back in the ground.

Here's my filled box. I stapled the weed cloth and it seems good so far! Thanks, everyone, for all the ideas and suggestions. This forum is great!

And, just because I can't resist. Here are some pictures of my littlest helper (you can see my second littlest running past in the other pic). He LOVES to play outside and get all dirty! It's going to be quite the challenge keeping him out of my boxes, especially as the seedlings get established.

I think he agrees with Mel that it's better to just use a trowel. He was getting so frustrated trying to pick that thing up. He LOVES to dig in the SFG with his trowel! First thing he does when he goes outside is look for a trowel. I'm have to keep them out of reach now that I'm planting.

LOL I am thinking he needs a sand box or something. MM is a bit pricey for him to be scattering all over the place, though.

His two older sisters (age 3 and 4) are getting the area where the box used to be (that wasn't level enough). I've put in some edging and we're going to grow some flowers and Sunberry plants (Wonderberry).